Prussian campaign (1626–1629)

Prussian campaign
Part of the Polish–Swedish War (1626–1629)

Ducal Prussia
Date6 July 1626 – September 1629
Location
Result Inconclusive
(see § Aftermath)
Belligerents
Swedish Empire Polish Lithuanian Commonwealth
Holy Roman Empire
Brandenburg-Prussia
 Danzig
Commanders and leaders
Gustavus Adolphus (WIA)
Carl Gyllenhielm
Axel Oxenstierna
Dietrich von Falkenberg
Lennart Torstensson
Johan Banér
Jindřich Matyáš Thurn #
Maximillian Teuffel
Johan Streiff
Herman Wrangel
Nils Stiernsköld 
Wolf Heinrich von Baudissin (POW)
Sigismund III Vasa
Stanisław Koniecpolski
Arend Dickmann 
George William
Hans Georg von Arnim-Boitzenburg
Strength
Initial landing force 11,500
1,209 cavalry
29 warships
31 smaller vessels
81 transport vessels
1627
21,000
1628
31,000
1629
At least 6,000–8,000
Initial force 10,000–11,000
1627
17,000
1628
Presumably smaller than the Swedish force
1629
At least 7,000
16,000 Imperial troops
Casualties and losses
30,000 dead Heavy

The Prussian campaign (1626–1629) was a Swedish invasion of Ducal Prussia during the Polish–Swedish War (1626–1629). Despite initial success, the campaign became a war of attrition and was inconclusive. Around 30,000 or more died on the Swedish side.